099年11月11日核正替换頁 六、發明說明： 【發明所屬之技術領域】 [0001] 本發明涉及一光學系統及採用該光學系統之光學記錄/再 現裝置。 【先前技術】 [0002] 在光碟機中，光學記錄/再現裝置以雷射光束在記錄介質 上寫入或讀出信息。參看第一圖，傳統之光學記錄/再現 裝置包括：一光發射元件1，一準直透鏡2，一光路改變 裝置3，一物鏡4，一聚光鏡5及一光接收元件6。由光發 射元件1發出的光束經準直透鏡2準直成為平行光束，該 平行光束經光路改變裝置3後由物鏡4聚愈.在記錄介質7上 ，並由該記錄介質7反射而自:、談反翁光束Μ物鏡4後由 · · · 光路改變裝置3轉向並經聚光鏡5聚焦在光接收元件6上。 其中，光束由記錄介質7上反射時會受到該記錄介質7記 錄信息的調製，光接收元件6接收到該反射光束後，進行 光電轉換，將該反射光束承載的信.i轉換為電信號並交 由後續電路處理。所述光發射元件1一般採用雷射二極體 〇 [0003] 用於對記錄介質進行信息寫入或讀出操作的雷射光束， 其理想狀態為一束圓形戴面的平行光束，而在實際應用 中，由雷射二極體發出的雷射光束並非十分理想。請參 看第二圖，雷射二極體10發出一束雷射光束，該雷射光 束在水平方向上的發射角0 1與其在垂直方向上的發射角 0 2並不相等，導致該雷射光束的戴面為一橢圓形。請參 看第三圖，該雷射光束在水平方向上的發射角0 1及其在 表單編號A0101 第3頁/共16頁 0993405072-0 1339395 I ' I 099年11月11 P!修正替挨頁~| 垂直方向上的發射角Θ2與兩方向上光束的相對光強的關 係曲線差距很大，如01最大角度只能取光軸兩側的10度 ，而（9 2最大角度可取光軸兩側的50度，這表明該雷射光 束橢圓截面的長軸在垂直方向上，短軸在水平方向上。 如將橢圓形光束直接會聚於光碟表面上並以此讀取信息 ，則光路存在光波面像差。而隨著光碟存儲密度的不斷 提高，光束的波長在不斷的縮短，其對光波面像差的要 求愈發嚴格。為解決該問題，習知技術採用孔徑角為雷 射二極體10最大水平發射角的圓形準直透鏡，因此可以 產生滿足要求的圓形截面光束（陰影部份）。然而，由於 ® 垂直發射角的部份光束被捨量的利用率 ^ 低。因此，為了獲得足夠清賴二極體需具 有較高功率。是以造成整伯1*光#^'錄/再4克裝置的成本難 於降低。 【發明内容】 [0004] 本發明之目的在於提供一用於羌學記錄/再現裝置中的光 學系統，其可提高光利用率。 [0005] 本發明另一目的在於提供一採用所述光學系統的光學記 錄/再現裝置。 [0006] 本發明之技術方案為：提供一光學系統，該光學系統包 括：一光源，以產生一光束；一準直透鏡，以對來自上 述光源的光束進行準直；一光束整形元件，以將由上述 t 光源發出經上述準直透鏡準直後的橢圓光束轉換成圓形 光束，該光束整形元件由一凸柱面鏡及一凹柱面鏡組成 ，該凸柱面鏡位於該準直透鏡與該凹柱面鏡之間，且該 094110606 表單編號 A0101 第 4 頁/共 16 頁 0993405072-0 339395 [0007] 099年11月11日梭正替換頁BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical system and an optical recording/reproducing apparatus using the optical system. [Prior Art] [0002] In an optical disk drive, an optical recording/reproducing apparatus writes or reads information on a recording medium with a laser beam. Referring to the first drawing, the conventional optical recording/reproducing apparatus includes a light-emitting element 1, a collimator lens 2, an optical path changing device 3, an objective lens 4, a condensing mirror 5, and a light-receiving element 6. The light beam emitted from the light-emitting element 1 is collimated by the collimator lens 2 into a parallel beam which is collected by the objective lens 4 via the optical path changing device 3. On the recording medium 7, and reflected by the recording medium 7 from: After the object mirror 4 is turned on, the optical path changing device 3 is turned and focused by the condensing mirror 5 on the light receiving element 6. Wherein, when the light beam is reflected by the recording medium 7, it is modulated by the information recorded by the recording medium 7. After receiving the reflected light beam, the light receiving element 6 performs photoelectric conversion, and converts the signal .i carried by the reflected beam into an electrical signal. Handed over by subsequent circuits. The light-emitting element 1 generally employs a laser diode (0003) for performing a writing or reading operation on a recording medium, and the ideal state is a bundle of circularly facing parallel beams. In practical applications, the laser beam emitted by the laser diode is not ideal. Referring to the second figure, the laser diode 10 emits a laser beam whose emission angle 0 1 in the horizontal direction is not equal to the emission angle 0 2 in the vertical direction, resulting in the laser beam. The wearing surface of the beam is an elliptical shape. Please refer to the third figure, the emission angle of the laser beam in the horizontal direction 0 1 and its form number A0101 page 3 / total 16 pages 0993405072-0 1339395 I 'I 099 November 11 P! ~| The relationship between the emission angle Θ2 in the vertical direction and the relative light intensity of the beam in both directions is very large. For example, the maximum angle of 01 can only take 10 degrees on both sides of the optical axis, and (9 2 the maximum angle can take both sides of the optical axis 50 degrees, which indicates that the long axis of the elliptical section of the laser beam is in the vertical direction and the short axis is in the horizontal direction. If the elliptical beam is directly concentrated on the surface of the optical disk and the information is read thereby, the optical path exists. Aberration. As the storage density of optical discs continues to increase, the wavelength of the beam is continuously shortened, and the requirements for optical wavefront aberration are becoming more and more strict. To solve this problem, the conventional technique uses the aperture angle as a laser diode. A circular collimating lens with a maximum horizontal emission angle of 10, so that a circular cross-section beam (shaded portion) can be produced. However, since the partial beam of the vertical emission angle is used, the utilization rate is low. In order to get enough The Lai diode needs to have a higher power. It is difficult to reduce the cost of causing the entire device to be recorded and reused. [0004] The object of the present invention is to provide a method for dropping out of school. An optical system in a recording/reproducing apparatus which can improve light utilization efficiency. [0005] Another object of the present invention is to provide an optical recording/reproducing apparatus using the optical system. [0006] The technical solution of the present invention is: providing An optical system comprising: a light source to generate a light beam; a collimating lens to collimate a light beam from the light source; and a beam shaping element to be emitted by the t-light source through the collimating lens The straight elliptical beam is converted into a circular beam, and the beam shaping element is composed of a convex cylindrical mirror and a concave cylindrical mirror, the convex cylindrical mirror is located between the collimating lens and the concave cylindrical mirror, and the 094110606 Form No. A0101 Page 4 of 16 0993405072-0 339395 [0007] November 11, 099 Shuttle Replacement Page
[0008] [0009] 兩柱面鏡的焦點重合，該凸柱面鏡面對準直透鏡的一面 為平面，背對該準直透鏡的一面為&面。 本發明之另一技術方案為：提供一光學記錄/再現裝置， 該光學記錄/再現裝置包括：一光學系統，包括一用以產 生光束的光源，一對該光源的出射光束進行準直的準直 透鏡及一對該準直透鏡的出射光束進行整形的光束整形 元件，該光束整形元件可將經準直透鏡準直後的橢圓光 束轉換為圓形光束，該光束整形元件由一凸柱面鏡及一 凹柱面鏡組成，該凸柱面鏡位於該準直透鏡與該凹柱面 鏡之間，且該兩柱面鏡的焦點重合；一光路改變裝置， 以使由上述光學系統的出射光束正常璉過，而改變記錄 介質的反射光束的光路；一鏡，以使上述光路改變裝 ( 置的出射光束聚焦在記錄介質上，而正常透過記錄介質 的反射光束；一聚光鏡，以對由上述光路改變裝置改變 光路的光束進行聚焦；一光接收元件，以接收來自上述 聚光鏡的光束。其中，該凸柱面鏡面對¥直透鏡的一面 為平面，背對該準直透鏡的一面為凸面。 與習知技術相比，本發明提供之光學系統採用一光束整 形元件， 該光束整形元件對橢圓光束的長轴進行壓縮以使該長轴 與短軸相等，從而將該橢圓光束轉換成為圓形光束。該 種方案充分利用了光源所發光束的光能量，可降低使用 該光學系統的光學記錄/再現裝置的成本。 [0010] 094110606 【實施方式】 請參看第四圖，其為本發明一實施例所揭示之光學系統 表單編號Α0101 第5頁/共16頁 0993405072-0 1339395 [099年U日11日栋TFS换ίΐ 11，該光學系統11包括：一雷射二極體111，一準直透鏡 112，一凸柱面鏡113及一凹柱面鏡114。該四個光學元 件按雷射二極體1U、準直透鏡112、凸柱面鏡〗13及凹 柱面鏡114的順序依次設置於光路中。其中’該凸柱面鏡 11 3與該凹柱面鏡U4在垂直方向上的同側焦點重合於一 點 116。 [0011]雷射二極體丨丨1發出的橢圓光束的短軸位於水平面上，該 方向為雷射光束的水平方向，雷射二極體111發出的橢圓 光束的長軸位於垂直面上，該方向為雷射光束的垂直方 向。 [0012] 在水平方向上，由雷射二極經準直透鏡 112準直後成為平行光束並。由於該 柱面鏡113的鏡軸在水平方向，故該凸柱面鏡丨丨3對於水 平入射的該平行光束相當於一平板透鏡，且該平行光束 垂直於該平板透鏡入射，故該平哲光束通過該凸柱面鏡 . ·. .[0009] [0009] The focus of the two cylindrical mirrors coincides, and one side of the convex mirror surface aligned with the straight lens is a plane, and one side of the collimating lens is a & Another technical solution of the present invention is to provide an optical recording/reproducing apparatus comprising: an optical system including a light source for generating a light beam, and a pair of outgoing light beams of the light source are collimated a straight lens and a pair of beam beams of the collimating lens for shaping a beam shaping element, the beam shaping element converting the elliptical beam collimated by the collimating lens into a circular beam, the beam shaping element being constituted by a convex cylindrical mirror And a concave cylindrical mirror, the convex cylindrical mirror is located between the collimating lens and the concave cylindrical mirror, and the focal points of the two cylindrical mirrors coincide; an optical path changing device to emit the optical system The light beam is normally passed over, and the optical path of the reflected beam of the recording medium is changed; a mirror is provided to cause the optical path changing device (the outgoing beam is focused on the recording medium, and the reflected beam is normally transmitted through the recording medium; a condensing mirror is used to The optical path changing means changes the light beam of the optical path for focusing; a light receiving element for receiving the light beam from the condensing mirror; wherein the convex cylindrical surface One side of the straight lens is a flat surface, and one side of the collimating lens is convex. Compared with the prior art, the optical system provided by the present invention uses a beam shaping element that compresses the long axis of the elliptical beam. The elliptical beam is converted into a circular beam by making the long axis and the minor axis equal, and this solution makes full use of the light energy of the light beam emitted from the light source, thereby reducing the cost of the optical recording/reproducing apparatus using the optical system. [0010] Embodiments Please refer to the fourth figure, which is an optical system form number Α0101, page 5/16 pages 0993405072-0 1339395 according to an embodiment of the present invention [099 U-day 11th building TFS exchange光学 11, the optical system 11 includes: a laser diode 111, a collimating lens 112, a convex cylindrical mirror 113 and a concave cylindrical mirror 114. The four optical components are laser diodes 1U, The order of the collimating lens 112, the convex cylindrical mirror 13 and the concave cylindrical mirror 114 is sequentially disposed in the optical path. The 'the convex cylindrical mirror 11 3 coincides with the same side focal point of the concave cylindrical mirror U4 in the vertical direction. At one point 116. [0011] The short axis of the elliptical beam emitted by the laser diode 位于1 is on a horizontal plane, which is the horizontal direction of the laser beam, and the long axis of the elliptical beam emitted by the laser diode 111 is on the vertical plane. The vertical direction of the laser beam. [0012] In the horizontal direction, the laser diode is collimated by the collimating lens 112 to become a parallel beam. Since the mirror axis of the cylindrical mirror 113 is in the horizontal direction, the convex cylinder surface The mirror beam 3 corresponds to a flat lens for the horizontally incident parallel beam, and the parallel beam is incident perpendicular to the plate lens, so the Pingzhe beam passes through the convex cylindrical mirror.
113後不發生任何變化，並入射至凹柱面鏡1丨4。而凹柱 面鏡114對於入射的該平行光束在.水平方向上的情況與凸 柱面鏡11 3相似’該平行光束π 5a在通過該凹柱面鏡114 後之水平方向依然不發生任何變化β [0013]在垂直方向上，由雷射二極體111發出的光束先經準直透 鏡112準直成為平行光束並入射至凸柱面鏡113。由於該 柱面鏡113的鏡軸在水平方向，故該凸柱面鏡113對於垂 直入射的平行光束相當於一聚焦透鏡，故該平行光束由 凸柱面鏡113會聚向其出射方的焦點116處，中途受到凹 柱面鏡114的阻擋》由於該柱面鏡114的鏡軸亦在水平方 094110606 表單編號Α0Ι01 第6頁/共16頁 0993405072-0 1339395No change occurred after 113 and was incident on the concave cylindrical mirror 1丨4. The concave cylindrical mirror 114 is similar to the convex cylindrical mirror 11 for the incident parallel beam. The parallel beam π 5a does not change in the horizontal direction after passing through the concave cylindrical mirror 114. [0013] In the vertical direction, the light beam emitted from the laser diode 111 is first collimated by the collimator lens 112 into a parallel beam and incident on the cylindrical mirror 113. Since the mirror axis of the cylindrical mirror 113 is in the horizontal direction, the convex cylindrical mirror 113 corresponds to a focusing lens for a normally incident parallel beam, so that the parallel beam is concentrated by the convex cylindrical mirror 113 toward the focal point 116 of the exiting side. At the middle, it is blocked by the concave cylindrical mirror 114. Since the mirror axis of the cylindrical mirror 114 is also horizontal 094110606 Form No. Ι0Ι01 Page 6/16 pages 0993405072-0 1339395
099年11月η日修正替換頁I 向，故該凹柱面鏡114對於入射光束在垂直方向上相當於 一發散透鏡，而該發散透鏡的出射方焦點位於凸桎面鏡 113之焦點116處，即入射光束向著發散透鏡的焦點方向 行進，因此，出射的光束115b為平行光束。 [0014] 由於水平方向上該光學系統1 1的出射光束1 15a與垂直方 向上該光學系統11的出射光束11 5b的寬度相等。因此， 原雷射二極體111發出並經準直透鏡11 2準直後的橢圓光 束經該光學系統11處理後，轉換為圓形光束，且不會造 成光能量的損失，雷射二極體111的發光功率可以降低》 [0015] 請參看第五圖’其為採用上述光學系統巧一光學記錄/再 現裝置（未標示），其包括：所:述光學系統11，一光路改 變裝置12，一物鏡13，一聚先鐃i4，一'光接收元件15。 由所述光學系統11發出圓形雷射光束，該雷射光束經光 路改變裝置12後入射至物鏡13，由物鏡13聚焦在記錄介 質16上’並由記錄介質16反射而回，該反辦光束經物鏡 13後由光路改變裝置12轉向入射至聚光鏡14，由聚光鏡 1 4聚焦在光接收元件1 5上.，被其吸收且轉換為電信號以 進行後績的信號處理等操作。由於在所述光學系統11中 ，雷射二極體111發出並經準直透鏡112準直後的橢圓光 束受到凸柱面鏡113及凹柱面鏡114的處理，使該糖圓光 束在垂直方向上寬度縮短以與其水平方向上的寬度相等 ，從而使該橢圓光束轉換為圓形光束，且無光能量的損 失。因此’雷射二極體111的發光功率可以降低，而採用 該光學系統11的該光學記錄/再現裝置（未標示）的工作效 率提高且成本降低。 094110606 表單編號A0101 第7頁/共16頁 0993405072-0 1339395In November 099, the η day correction replaces the page I direction, so the concave cylindrical mirror 114 corresponds to a diverging lens in the vertical direction with respect to the incident beam, and the exiting focal point of the diverging lens is located at the focus 116 of the convex mirror 113. That is, the incident beam travels in the direction of the focus of the diverging lens, and therefore, the outgoing beam 115b is a parallel beam. [0014] Since the outgoing beam 1 15a of the optical system 11 in the horizontal direction is equal to the width of the outgoing beam 11 5b of the optical system 11 in the vertical direction. Therefore, the elliptical beam emitted by the original laser diode 111 and collimated by the collimating lens 11 2 is processed by the optical system 11 to be converted into a circular beam without causing loss of light energy, and the laser diode The luminous power of 111 can be lowered. [0015] Please refer to the fifth figure, which is an optical recording/reproducing device (not shown) using the optical system described above, which includes: the optical system 11, an optical path changing device 12, An objective lens 13, a first illuminator i4, a 'light receiving element 15. A circular laser beam is emitted from the optical system 11, and the laser beam is incident on the objective lens 13 via the optical path changing device 12, and is focused on the recording medium 16 by the objective lens 13 and reflected back by the recording medium 16, which is reversed. The light beam passes through the objective lens 13 and is deflected by the optical path changing device 12 to be incident on the condensing mirror 14, and is focused by the condensing mirror 14 on the light receiving element 15. It is absorbed and converted into an electrical signal to perform signal processing or the like. Since in the optical system 11, the elliptical beam emitted by the laser diode 111 and collimated by the collimating lens 112 is processed by the convex cylindrical mirror 113 and the concave cylindrical mirror 114, the sugar circular beam is vertically oriented. The upper width is shortened to be equal to the width in the horizontal direction, thereby converting the elliptical beam into a circular beam without loss of light energy. Therefore, the luminous power of the laser diode 111 can be lowered, and the optical recording/reproducing apparatus (not shown) using the optical system 11 is improved in work efficiency and cost. 094110606 Form No. A0101 Page 7 of 16 0993405072-0 1339395
I 〇gg年11月η P!孩正替換頁II 〇 gg 11 November η P! Child is replacing page I
[0016] 綜上所述，本發明符合發明專利要件，爰依法提出專利 申請。惟，以上所述者僅為本發明之較佳實施例，舉凡 熟悉本發明技藝之人士，在援依本發明精神所作之等效 修飾或變化，皆應包含於以下之申請專利範圍内·> 【圖式簡單說明】 [0017] 第一圖係傳統光學記錄/再現裝置結構示意圖。 [0018] 第二圖係一般雷射二極體發出橢圓光束工作示意圖。 [0019] 第三圖係雷射二極體發出的橢圓光束於垂直及水平方向 的光發射角與相對光強度的關係示意圖。 · [0020] 第四圖係本發明提供之光學意畢。 — [0021] 第五圖係使用本發明之光學再現裝置結 構示意圖。 【主要元件符號說明】 [0022] 光學系統：11 [0023] 光發射元件：1 [0024] 雷射二極體：111 [0025] 準直透鏡：2,112 [0026] 凸柱面鏡：1 1 3 [0027] 凹柱面鏡：11 4 [0028] 光路改變裝置：3, 12 [0029] 物鏡：4, 13 094110606 表單編號A0101 第8頁/共16頁 0993405072-0 1339395 [0030] 聚光鏡：5, [0031] 光接收元件 [0032] 記錄介質： 14:6, 15 7, 16 099年11月11日梭正替換頁[0016] In summary, the present invention complies with the requirements of the invention patent, and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS [0017] The first figure is a schematic structural view of a conventional optical recording/reproducing apparatus. [0018] The second figure is a schematic diagram of a general laser diode emitting an elliptical beam. [0019] The third diagram is a schematic diagram showing the relationship between the light emission angles of the elliptical beams emitted by the laser diodes and the relative light intensities in the vertical and horizontal directions. [0020] The fourth figure is the optical meaning provided by the present invention. [0021] The fifth drawing is a schematic view showing the configuration of an optical reproducing apparatus using the present invention. [Main component symbol description] [0022] Optical system: 11 [0023] Light emitting element: 1 [0024] Laser diode: 111 [0025] Collimating lens: 2, 112 [0026] Coronal mirror: 1 1 3 Concave cylindrical mirror: 11 4 [0028] Optical path changing device: 3, 12 [0029] Objective lens: 4, 13 094110606 Form number A0101 Page 8 / Total 16 pages 0993405072-0 1339395 [0030] Condenser: 5, [0031] Light receiving element [0032] Recording medium: 14:6, 15 7, 16 November 11, 2010 Shuttle replacement page
094110606 表單編號A0101 第9頁/共16頁 0993405072-0094110606 Form No. A0101 Page 9 of 16 0993405072-0